Exercise result: Exporting pdf is impossible #3222

[carlangas159]

Possible fix to
"Notice: ob_clean(): failed to delete buffer. No buffer to delete in /furanet/sites/11.chamilo.org/web/htdocs/main/exercise/exercise_show.php on line 942"

https://www.php.net/manual/en/function.ob-clean.php#Hcom114967

Check if had buffer.

[FlintCIBot]

Lint errors were found. A patch is also available.

Please see the report: https://flintci.io/repositories/1013/analyses/38165

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[carlangas159]

i can't reproduce this on my local chamilo (windows) and into https://dev1.beeznest.com/.

I did several tests and I could not replicate the download of the wrong pdf. Although in a moment I noticed that it was not downloading correctly, 5 seconds later it opened the file correctly.

At the moment on 11.chamilo.org in the following link

https://11.chamilo.org/main/exercise/exercise_show.php?cidReq=NICODU&id_session=0&gidReq=0&gradebook=0&origin=&id=224&action=export&

"Notice: ob_clean (): failed to delete buffer. No buffer to delete in /furanet/sites/11.chamilo.org/web/htdocs/main/exercise/exercise_show.php on line 942"

There may be no buffer stored when trying to clean, so I check to see if the buffer exists.

It is still possible that the errors in 11.chamilo.org persist regarding:

"Warning: count (): Parameter must be an array or an object that implements Countable in /furanet/sites/11.chamilo.org/web/htdocs/vendor/mpdf/mpdf/classes/otl.php on line 5840"

content is a character string, at the moment it would be good to check if it is a problem by ob_clean

[ywarnier]

As per https://www.php.net/ob_get_contents, this looks like a reasonnable attempt at fixing it...